I shared a table at a convention with a friend once and he ended up saying that he think my comic does not look professional enough. I asked him what he meant by that and he said they should look more like dreamworks or pixar characters designs, apparently that's what all professional art should strive for. It's not like he told me an arm was drawn bad or that a composition wasn't clear. It's just that it should look more like pixar. Personally, I'm not into art that looks like that and hate doing a lot of extravagant gesture drawings as well as exaggerating features on characters. That being said, he is an illustrator, while I am a fine artist so we have different viewpoints on what our comics should look like. Anyways I said thanks for the advice and he said, "if you ever need help fixing your comic, let me know."
At the same time though, he was unable to see how badly his own zine comic came out. The art quality I thought was pretty good, but he did not plan his schedule properly and barley finished it before the convention. The printouts of his zine looked very rough and the zine was missing the last page. production wise, it was not that strong. Also I thought his story was the most cliché story I ever read. It was a kid going to a new town, gets bullied a little, kicks ball over fence into the scary house, scary house ends up having a nice old lady, learns lesson. I tried to tell him what I thought but he was just would not listen to my criticism but had no trouble dishing out criticism about my stuff. It was kind of annoying.
I don't know where I am going with this rant. Overall I think people got to take criticism with a grain of salt and realize the best critic is yourself. Also another thing I've learned in grad school for fine arts is don't be afraid to argue criticism. I emailed that guy, Paul, thanking him for his input but I like my comic and I known other people that have really enjoyed it and I'm sorry it was not his cup of tea.
I think you don't have to bend over and just take criticism as well. If you worked hard on something I think you also have to be willing to defend your work, which is something I think people forget.